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arXiv 1609.02553astro-ph.GA
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钱德拉COSMOS遗产调查:使用光度红移概率分布函数在2.9<z<5.5处对X射线选择的AGN进行聚类

The Chandra COSMOS Legacy Survey: Clustering of X-ray selected AGN at 2.9<z<5.5 using photometric redshift Probability Distribution Functions

V. Allevato, F. Civano, A. Finoguenov, S. Marchesi, F. Shankar, G. Zamorani, G. Hasinger, M. Salvato, T. Miyaji, R. Gilli, N. Cappelluti, M. Brusa, H. Suh, G. L… 展开作者

V. Allevato, F. Civano, A. Finoguenov, S. Marchesi, F. Shankar, G. Zamorani, G. Hasinger, M. Salvato, T. Miyaji, R. Gilli, N. Cappelluti, M. Brusa, H. Suh, G. Lanzuisi, B. Trakhtenbrot, R. Griffiths, C. Vignali, K. Schawinski, A. Karim

摘要:

我们提出了测量的投影和红移空间2-点相关函数(2 pcf)的新目录的钱德拉COSMOS遗产活动星系核在2.9 $\leq$ z $\leq$ 5.5($\langle L_{bol} \rangle \sim$ 10 $^{46}$ erg/s)使用广义聚类估计的基础上,除了任何可用的spec-z的概率分布函数(Pdfs)。我们使用$π_{max}$ = 200 h $^{-1}$ Mpc和2-晕项对预计的2 pcf进行建模,并得出z $\sim$ 3.4处的偏差等于b = 6.6 $^{+0.60}_{-0.55}$,这对应于log M $_h$ = 12.83 $^{+0.12}_{-0.11}$ h $^{-1}$ M $_{\odot}$的宿主晕的典型质量。使用红移空间2 pcf推导出类似的偏差,包括我们的样品在z $\geq$ 2.9处的典型光z误差$σ_z$ = 0.052。一旦我们将预测的2 pcf积分到$π_{max}$ = 200 h $^{-1}$ Mpc,Allevato等人(2014)在z=2.8时使用的XMM和\textit{Chandra} COSMOS的偏差与我们在更高红移时的结果一致。结果表明,在z $\gtrsim$ 3处,COSMOS活动星系核的偏置因子仅略有增加,中等亮度活动星系核的典型宿主晕质量几乎随红移而保持不变,在z=2.8处,其质量为logM $_h$ = 12.92 $^{+0.13}_{-0.18}$,在z $\sim$ 3.4处,其质量为logM $_h$ = 12.83 $^{+0.12}_{-0.11}$.观测到的COSMOS活动星系核的红移演化表明,中等亮度的活动星系核仍然存在于z $\gtrsim$ 3处的团大小的晕中,但质量略小于使用z $\leq2$处的X射线活动星系核进行的不同独立研究中观测到的质量。

英文摘要:

We present the measurement of the projected and redshift space 2-point correlation function (2pcf) of the new catalog of Chandra COSMOS-Legacy AGN at 2.9$\leq$z$\leq$5.5 ($\langle L_{bol} \rangle \sim$10$^{46}$ erg/s) using the generalized clustering estimator based on phot-z probability distribution functions (Pdfs) in addition to any available spec-z. We model the projected 2pcf estimated using $π_{max}$ = 200 h$^{-1}$ Mpc with the 2-halo term and we derive a bias at z$\sim$3.4 equal to b = 6.6$^{+0.60}_{-0.55}$, which corresponds to a typical mass of the hosting halos of log M$_h$ = 12.83$^{+0.12}_{-0.11}$ h$^{-1}$ M$_{\odot}$. A similar bias is derived using the redshift-space 2pcf, modelled including the typical phot-z error $σ_z$ = 0.052 of our sample at z$\geq$2.9. Once we integrate the projected 2pcf up to $π_{max}$ = 200 h$^{-1}$ Mpc, the bias of XMM and \textit{Chandra} COSMOS at z=2.8 used in Allevato et al. (2014) is consistent with our results at higher redshift. The results suggest only a slight increase of the bias factor of COSMOS AGN at z$\gtrsim$3 with the typical hosting halo mass of moderate luminosity AGN almost constant with redshift and equal to logM$_h$ = 12.92$^{+0.13}_{-0.18}$ at z=2.8 and log M$_h$ = 12.83$^{+0.12}_{-0.11}$ at z$\sim$3.4, respectively. The observed redshift evolution of the bias of COSMOS AGN implies that moderate luminosity AGN still inhabit group-sized halos at z$\gtrsim$3, but slightly less massive than observed in different independent studies using X-ray AGN at z$\leq2$.

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